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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '346166f854f5120674ae0210959a93539ee1b357b53b34c9e26a602957630d0f' 
  AND token = 'gooxtc6eeafHS1Az1wKo7HermAbkNl6t17ZdV2skF+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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