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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11a7251019472f0af03babb969705e7e7c0d1cba75b5b23691520dd6ede6dce5' 
  AND token = 'pkz2JLKUEUIbjlc/iasJTEWTSt9iRvm/9f1ti3JAA80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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