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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c072c237d805e9070244bc1e90efdcaa8c7c5ebe41fd57bceb71f14c735168cf' 
  AND token = 'GubGgtQK9tMl0YiaDTIUBieRv1R35BhwHF3hnkZb7OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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