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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '398709dbfa3aef70f24c60be5b689d54cea95f17efda629ecbba657382e90c35' 
  AND token = 'yfc0GGuAlwxS7G7imSN9hp/LcY18npIb4/DSkUrXsEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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