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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb26e607d238465d5fee6986772bee0820752ec006ba5b7f749239a25dda8e88' 
  AND token = 'YARukqbSJZg0WrBhjEFMbT2DeQiRPS6bF2D5EJE0D/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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