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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4899e80ff564b2d370ae28135a31d09e6353b47b46341b5c2b063e0315d304ed' 
  AND token = 'pXJl/aGNpaR7TcgGQrmkBG571F9f5ymXeQ/kgGkr2aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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