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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '829f0723d87f1e71f9c2246e1b5953995780552d9a6e22c99f2a5580d5552a49' 
  AND token = '95zJH/tBSJwLsi03Omif0AuCIuMN1s8pcPOxsGpq9rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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