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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14cdcbb1bae17581cbbf88d1adfc6708ccaefbc68dfafd447fa2ed2b0417c105' 
  AND token = 'Btizuv4PK53D4bOx4Z7xtq0t7lRLDs+IQBOGIUNPCo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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