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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2de0bf0e518774dcde5de844294eddfe71830be2846c6774854954142ee811c' 
  AND token = 'SDYowlnVe3mDDcMV0l60KUZpcgGP+LcktB7cw2jUHVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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