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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1693d07ec8a9bb1df9b2a43fae17b05cf0936437a56e5807da7c3d2ee30b0e8' 
  AND token = 'Z6tbMy4QUVZZPKjYyuSXGBUbr0PiEjk2PXxBQwsaP+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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