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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5b19d1da4f538ef03ff4f14f81ba5a127e05e03956fd11a6b16b80605858845' 
  AND token = 'xxoGks7TigE7tyPrCkRWBTqQKi1LmnyFhe8ddM/gxkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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