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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fe690027d36d96693e15c0cc5f04a2971a6154b264e0e38e09c61a7163a9c55' 
  AND token = '5Zmn1cWESIg/FrqZSVfSZQtRt8KEMz2BtPcAjMJUa1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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