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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9df1f56b686c46dc9defd3e19e17a9e0d1419f1d69e764085dceb7c6c4992207' 
  AND token = '2OPoFAKkN0Qzg1zND8eTkx77BUHrZj1w7DBn5YYtKwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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