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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '620ace333573d1f90c2929ce49559b776eef4c8f12c4ba1ec4600744b2e17f55' 
  AND token = 'saNBoqPuT0M4xqXoYm40o8od9USp5wnNojDU7ghfyCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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