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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fb4f51513662b02761e3ca64f6fdbb6009f251ff6a24fb7f22239eff2e97d2f' 
  AND token = 'pd8Cijb3WrJ10v2nHBFy1OXgnJbjU0BaM7p3doRXfmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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