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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf2f5e09075749137b6bc3a081b2d53a2e3a29e9f1c57c0d8b4c4d550f70bbbf' 
  AND token = 'Fow3gcCgQE9oGZeNYydT0UmHfrqm0fEIZUFy9vKfNGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}