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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d2987d11d66a85b3c33e0eb4ab1b7699fc81a946f324112107616f15d6c5178' 
  AND token = 'vkPG5FBJye14rhhQ/95CbwiZJPcmGAWJ7csvbfA4vo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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