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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7666ada29984cee18d9bc2a311bac857d30efa9699c73bd69ddb4c81dc3a97a6' 
  AND token = 'GHd2wjZpSzic8CN4ki4ONmmvDe310uVEioBvGWIEYKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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