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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '597a05c5c248519a96198b034d0e5c4b4c3046ed907950e9d69683091643371e' 
  AND token = '1Xm/PLxnRbS/ahPMDPPLVgt+BpsfH1EYRtO4Hf+BEIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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