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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55a23f4dea541136027258c35db921610aeb52b48208d0e70b0fbb0006c30bc7' 
  AND token = 'kqhvSnnLUOgfitYYVP5PgqC98RE5dwCnFK8asAqtJsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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