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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '362b47c6d16ff567082d85cc5ab65a88f8867968e9fab6daeb448714bbf2fe0c' 
  AND token = '/U8apWf2FzS817ZK/5xCYOcD3s/IN+XzLkrrUPxQ8Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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