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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b700bcdf3aae223443a4ea7a539a27a061ddcf60b73eae5cf9eab64f5a8f1e15' 
  AND token = 'E5PP7pO9vFgLrwVXw97k8i+zfz2/WfY3qQSZ4x09aCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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