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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4287de538e36cf4b31090e5fbabef23e79d68eddb0b5fec7dbb54c08fbb5993a' 
  AND token = 'VmXonn82tVcHjk9drF5VoZ0Uq0R+5hTgxc8Wsh3KcCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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