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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df9e24f0232963a5c3cbfc831b7a6c139451662458bc18a94e4e2ac54a620d9f' 
  AND token = 'tRf/FLC/rr3KtHebYVKEtzk5uOMhfoACkzk8X7oJDnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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