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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f71b4ede61f2e5712eeeb4aa4813328e2aacfd1e38dc150b3f9be1e2bd2c3d8a' 
  AND token = '8XOpyNey0lxKTSrNBpo+L8mVvqVMB3Ai2Kbe1kFHwOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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