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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab9a8cfa97cd40e184fcd6349c9a2eba2b272b5726c3eab7bce060ef4883aba9' 
  AND token = 'Nc8t0nz09KbpFP2PY0FLg8n1ZrsombTtB7yr4+Bt77k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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