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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66b795a55ab9c866d8e6c7c5aaf686c611367d11cb75bc4e202cc89e4d57080c' 
  AND token = 'IJoOX/qgj9kn/3tZ3GeB/E5Z8KPQQuwxlMiQKykqaTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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