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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '926a6ea49776d8b4cbcbcd157b294835a26ca7e1e247f807434541bcd1454dac' 
  AND token = 'sdAF2rB0WQgf4SwBNwWWp3MYXq4rP2Jigto1oY0fF4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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