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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2cf84738e856e48ae16b959306c785f34816e617f2a0dde1e3b4d0d23795d4f' 
  AND token = '01JTaTgIiiIBdSD0mZZLczRks+0IJghj10RTLA+MJAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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