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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed0875fe561c8d4c6c5a95d7104afabdc747cf9fa0fdf3e688da24c74cd29c85' 
  AND token = '+QOM2/XeZgkIhb6brann0SpRd1+V0i9W2Cf5Sd8no+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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