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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '149437d6a297e394965e0a2e99b216e12b53ebdaa3175bb1772e03f7afe96b4a' 
  AND token = 'XCfjrbcRiwj3Tjv+KWSteUH7n7aWITNyzRK/+kXT0Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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