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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13ef50563b0517276bff67c40f052f30184cbdf50650f4635078c3b33606ff02' 
  AND token = 'CKEcJFS9ypXcHnV2/mMCXUTr5vyIHJo4zZeppig+53U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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