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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e7b49a34e77810d38bbc9fc2542abd0d856d0e94342cc134f6afc1a4ff6ca79' 
  AND token = 'hAenpIshpcLwkctnLUN/XAhqn1c6tMEwF0WIZWEJp6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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