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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '520659404cf613a494aee8b63643fa170d9a3f64ee4a18734388288c662f614c' 
  AND token = 'TMgxegoSRQHsjCb7MP3sNS+0fYVHerDMpLPyCNIIIyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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