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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '620a1eca600523be56b01b50be8ae57a00b735826d719f5c24a862ed1ade6b30' 
  AND token = 'X5k5qN+kot9NghaJMFBSTFGaQlH9LmYRipXrdiW1jUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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