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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bc47c5e54c63068e8cac005d42e240dfc0bcd19338edd2875bc08c11ceca017' 
  AND token = '6q+S1ViSJC6Z9PP5urZJk7xISbLgQ1SAiOsK8/LdH7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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