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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dffe01c1be1bf06c1800751d1f2b37ce20cd9d36d31b68c585f1f1cb5b6c96a' 
  AND token = 'PlBxrHt+glQH6GN45C0AdewWFT2vtqni4zeGVUeBIuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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