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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '610671ed9ffd326c5c72e10f47934796d4a6ef734372e3ed554ae9b4007feb03' 
  AND token = 'KbRYXmNe813YP/l8cNe6F9Y0GgCLYyH0U+KB9pekBJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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