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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f89341a6034118d9bf13c541a193e3d36063c38996d3d92ad5fd0b54b05c562' 
  AND token = '4gXtH16wCc4tUSKZBVjpfwV4zH5WDuMoXP7hp1stscA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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