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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56c55bc8868e8f734f9bee19e37cf7199cff48f92e11d54c9299a1e04e1c8208' 
  AND token = 'D5zx6rrpo5VsxkB58lGlTjjNz317SUGitz1PE84227M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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