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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '342ba6b63f733c86a236078b7502724c072e1a7c2baecc97f2b5a5604f259179' 
  AND token = 'VAQd2RyI9bCCxapubh0rRMHOsQngWRCMDHli+wEGwhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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