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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99214c9164547b974cc24b4ae7f773da118bfed42d9fb38d98144cdb605004e3' 
  AND token = 'oofGwg7b63ig6gs+miOwnIvqOPzFzP3w3aW48TbLSOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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