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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0e5e9c3c60580dbbd688608dd5c116ea483638df26fc6ab1885a8024b7b7b71' 
  AND token = '42i3nFYswcEATFyYaZKRvM7kfKDzaShKVpyd1Z5GUQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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