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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3af8bf20c0d589bc2f4e3bfa93b70b4b461187a0c608a9cd3b843eb4bd021c01' 
  AND token = '6znerEWcJWBLrkbNVM6lGMkr5M7Ay4KjwmfBXAiix7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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