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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ffc0bf4ea1a0dc1663b0016f8a9efd782ee963c9980833ad5609a6c41cfb4f4' 
  AND token = '3lfXN9I/Ga3mtXP7TIlyOHAumteIDyTb3BW4QyBTPls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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