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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31817307e02e69d6508614e6031552ce5e01a12d3873e9b9df34c160b78acc81' 
  AND token = 'JW+l2oi5xNmCNhtt1qi31QOyYLdaAlHIbtHlwplzfo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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