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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0879410d336041839c683d2b4d85b2a546bbc27d9318391355a2eb1c0f9e8d2d' 
  AND token = 'e4Zu+63cELkJYi7EskUJ2pUm5B3ziFvlrSj3LCzFeJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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