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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd529e4440642b6263aae495f9244ac8e81a732a0d934cbe34dc3409edb9ab272' 
  AND token = '3sefIrr8eNkmMz/weofbaW5ZCE10a3dbMm2Z0UJaGys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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