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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '701b27890a4af37b8c2b5573b2b83f042253fa2210a40cb432ade25939fed9c6' 
  AND token = 'I6YgxbceEfMu0t2MsUWcPQ97q85cNAYUyqnFDU3jyQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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