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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54ab6576071eaac6e201c78bce2dd3c0943dce48d3a3e474c461f6b7b2495df3' 
  AND token = 'SeFLbHkZNvbWvJJYU7tsT+oCJoMoJ30KuIIf0+CQ8S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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