SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd23e2c10bfe6c739129d71a37bfa433675dece229c80e50bc02203e45df0b29f' 
  AND token = 'hRDfL4L+zkRXYsSv73EHrAVwd7k3gNOBfMrG+yGZ2vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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