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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8331bf30cc799e376efceb0a15309ecc7a7da1ce8cca8346a80b99800be54cac' 
  AND token = 'Q5L6DkfFyAkbygje9oXaLW1iN4xIxM966Ag1v2eJwHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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