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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5f3183147c29a699128a1752eb4f161893e77cb161b30b14c1a24ef1ed8a8ea' 
  AND token = 'ZnfyyH79/rjeewJyPyWkBVbFplWPfv+QeQkVwV6Ytr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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