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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e8c005417469dae04ff3b4cfd472e9dcf7b7744b1bb7b7ce0ae674ba506d7e9' 
  AND token = 'ulLzG7+HPvfKeNkqBt3tSYxgcB0J/JSEVwRyJ12RdVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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