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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efb9652f7fc1138a5aa663731f8ff1fff8830d2237325e36977f5b2d615b3419' 
  AND token = 'zOCuv/etnAnrT+al9f9+4v7EfRpV1e2PaUCp2j6zWh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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