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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '074c841580b33e11c9e4b1c2642cf951bc80822e78df44b336a4ca5a25103b5d' 
  AND token = 'FS/DELpZdOk8SmQjbliFx9+PdYZjadQp6sh8vD7vA8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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