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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '583aed89a9ab60a5710f9c59d086d9acff3121ecbdc23c8e7ae6cded92fe1df4' 
  AND token = '8j7ueKZo1TTNfM9kVujcz/w1Wfp50XiP+NrM0orhXDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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