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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a290e94ef08c9e20b347055c76c7f6778de4eb038da245c9a483ddf987ff82d5' 
  AND token = '9x6E+ZNW7kn40LGFnmDed3gABXUGMr8bVx5HPj9QGDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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