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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0caac731dda7cebb75508737ce742b662d7c50956aa530a0f445d695d34b4d5b' 
  AND token = 'MXq9QfSjH2qGOyCGzXYcXV3st5sWoiq2pspqHzDOXC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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