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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00baca1940a6dff270feb99e58000d04e1ba8888df04d1d06a6eff7dca667581' 
  AND token = 'WkcbQcQIbt9WuLTqGckIO+atOje+ARaSTsXtdcO9EvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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