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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30b72fd2e5bb509101603dd6469a421b41bdf0d963990c38a056d4282e77df49' 
  AND token = 'Ea9zmppoHivvoyw61EbUp5lm2iAqBh/kN97924MtwXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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