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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cc6b523591efa18564a6d82a4cd7ae7d1a94d242a358284ec9c0b8592110016' 
  AND token = 'qjb/VL/+myXvNSwyR2DtEW0NClB4yWiiaN+bft7o2f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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