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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76212a44e76e7903b8fdcb63703e882374fdd68a5ccc8919629101e3f226504f' 
  AND token = 'SSqq/qD1jwRn1QfwnM0/yu6ssXd7cOZtrmoXg0visdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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