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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55599db4e79a772e83e59593e27d0483f6db4518d030e9bc9938e1b2435b9136' 
  AND token = 'wJ7+iZH9e2eU4z/AlAe4p6t0KdT++qsHwoHQQ1DNfws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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