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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c4d5404ef7dd6f0e139529802f4590c2379880d1bd517b9cb5486b2d3e4f495' 
  AND token = '8ziEx1vLrlw9DN5Bte5butFTghkndt490QRjCLHDfec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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