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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '589b9304abd8a1d5f32cdc3a66822c96f7ca197bf25417e47c3641d08ea53fed' 
  AND token = 'g6R+Rlu1gTY7/gkSpecJ94H15rpQ98EHPXfg/DsRAMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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