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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '899b31cedcc08ae8388e9db79d078df14c5d76f3d49e8a9c42fa24718c940fe4' 
  AND token = 'LG2AGd/Mji69hY8y63AnU/KLCc+2PC7Tgoe65MtAa5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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