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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1abbe3cb3415139f7eecd9f48e20a5d7d9b8587e9a11e2b3e66d104262ff6c8' 
  AND token = 'Y3kqubSyyW7QHcME2sWoH3HvW+bswdCBovvw6yFWPAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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